Closure shell



FIG. 1 is a perspective view of a closure shell showing our new design;

FIG. 2 is a front elevational view thereof, the rear elevational view and two side elevational views being identical; and,

FIG. 3 is a top plan view thereof, the bottom of the closure shell forming no part of the claimed design. 

We claim the ornamental design for a closure shell, as shown and described. 